Thamnodynastes is a genus of snakes in the subfamily Dipsadinae of the family Colubridae.

All species in the genus Thamnodynastes are endemic to South America.

[1] The following four species are recognized as being valid.

Nota bene: A binomial authority in parentheses indicates that the species was originally described in a genus other than Thamnodynastes.

This article relating to Dipsadinae is a stub.